Adding Room Key Verification Stuff

resources/qml/UserProfile.qml

resources/qml/delegates/MessageDelegate.qml

src/Cache.cpp

src/ChatPage.h

src/DeviceVerificationFlow.cpp

src/DeviceVerificationFlow.h

src/EventAccessors.cpp

src/Olm.cpp

src/timeline/TimelineModel.cpp

src/timeline/TimelineModel.h

src/timeline/TimelineViewManager.cpp

src/timeline/TimelineViewManager.h

src/ui/UserProfile.cpp

src/ui/UserProfile.h